On 28/06/11 11.35, Dr. H. Nikolaus Schaller wrote:
> A quick update: WiFi is now working.
>Hi Nikolaus
This is also great news ;-)
> 1. we did not recognize correctly that albeit the WLAB/BT combo has
> split supply for both components, it is not allowed to power up/down
> them separately.
>...
> Well, for mass production this is not a good solution and we therefore
> consider a separate LDO for the GTA04A4 layout.
>
If or when you redesign the PCB, please make a (short) video where you
edit the copper-layers via the special java program, that you said was
better than most PCB-programs. Possibly with some youtube annotations.
"A day in a smartphone designers life"
> One observation so far: power demand is quite high. The board draws
> approx. 250-300 mA while booting. And this goes up to 450-490 mA
> after WLAN is loaded and enabled. All this for a 1200 Ah battery...
>
I have a similar problem with another smartphone of a major brand. If I
do not disable wi-fi before going home from work, the battery is drained
considerably. When I first got that smartphone, I was baffled that it
sometimes only worked up to a day - and at other times 3 full days. My
college told me it might be the wi-fi's fault - and it was. Please note,
that this was with the OS built-in normal powersaving capability. All in
all - smartphones do not like a lot of appearing and disappearing access
points - possibly trying keeping up with weak signals.
If I open a GPS program and leave it open, the battery is drained in
about one or two days.
-
All smartphones ought to have the possibility to gracefully degrade to a
common mobile phone, when e.g. only 25% of the battery capacity is left
- while no external power is supplied.
Glenn